Improved the blur sample

samples/SkiaSharpSample.Shared/Samples/BlurMaskFilterSample.cs

@@ -19,15 +19,63 @@ namespace SkiaSharpSample.Samples
 			canvas.DrawColor(SKColors.White);
 
 			using (var paint = new SKPaint())
-			using (var filter = SKMaskFilter.CreateBlur(SKBlurStyle.Normal, 5.0f))
+			using (var filter = SKMaskFilter.CreateBlur(SKBlurStyle.Normal, 5.0f, SKBlurMaskFilterFlags.HighQuality))
 			{
 				paint.IsAntialias = true;
 				paint.TextSize = 120;
 				paint.TextAlign = SKTextAlign.Center;
 				paint.MaskFilter = filter;
 
-				canvas.DrawText("SkiaSharp", width / 2f, height / 2f, paint);
+				canvas.DrawText("SkiaSharp", width / 2f, height / 4f, paint);
 			}
+
+			// scale up so we don't have to change the values in the method
+			var scaling = 3;
+			canvas.Scale(scaling, scaling);
+			var rect = SKRect.Create(width / (3f * scaling), height / (2f * scaling), width / (3f * scaling), height / (4f * scaling));
+
+			DrawInnerBlurRectangle(canvas, rect);
+		}
+
+		private void DrawInnerBlurRectangle(SKCanvas canvas, SKRect rect)
+		{
+			// create the rounded rectangle
+			var roundedRect = new SKPath();
+			roundedRect.AddRoundedRect(rect, 10, 10);
+
+			// draw the white background
+			var p = new SKPaint
+			{
+				IsAntialias = true,
+				Style = SKPaintStyle.Fill,
+				Color = SKColors.White
+			};
+			canvas.DrawPath(roundedRect, p);
+
+			using (new SKAutoCanvasRestore(canvas))
+			{
+				// clip the canvas to stop the blur from appearing outside
+				canvas.ClipPath(roundedRect, SKClipOperation.Intersect, true);
+
+				// draw the wide blur all around
+				p.Color = SKColors.Black;
+				p.Style = SKPaintStyle.Stroke;
+				p.StrokeWidth = 2;
+				p.MaskFilter = SKMaskFilter.CreateBlur(SKBlurStyle.Normal, 2, SKBlurMaskFilterFlags.HighQuality);
+				canvas.Translate(0.5f, 1.5f);
+				canvas.DrawPath(roundedRect, p);
+
+				// draw the narrow blur at the top
+				p.StrokeWidth = 1;
+				p.MaskFilter = SKMaskFilter.CreateBlur(SKBlurStyle.Normal, 1, SKBlurMaskFilterFlags.HighQuality);
+				canvas.DrawPath(roundedRect, p);
+			}
+
+			// draw the border
+			p.StrokeWidth = 2;
+			p.MaskFilter = null;
+			p.Color = SampleMedia.Colors.XamarinGreen;
+			canvas.DrawPath(roundedRect, p);
 		}
 	}
 }